Date: __/__/____ (Date)
_________ (Name of the friend)
_________ (Address of the friend)
Subject: Birthday invitation letter
Dear _________ (Name),
I hope you are doing well and I would like to inform you that I am also good here.
I am happy to inform you that I am turning __________ (mention age) this year and I write this letter to invite you to my birthday celebration to be conducted on __/__/____ (date) at ________ (venue). I have invited some of my friends and family members to the party.
You are requested to be present at the venue at __:__ (time).
__________ (Contact details)